The Research on the Value Influence of the pany Caused by Cash Dividend--Basing on the Empirical Research of Mandatory Cash Dividend Rule 20 25 30 35 40 Li Yanxi, Sun Wenzhang (Facutly of Management and Economics,Dalian University of Technology,Dalian 116024) Abstract: The research on the relationship between cash dividend and corporate value makes great contribution to regulate the dividend distribution behavior, and to promote the development of the stock market positively. Basing on the <Decisions on Amending Some Provisions on Cash Dividends by panies> released by CSRC on October 9,2008, the paper utilizes time series prediction, OLS and nonlinear regression, to investigate the cash dividend situation of all panies from Shanghai Stock Exchange and Shenzhen Stock Exchange listed from 2004 to 2011. We find that panies of which profits after abnormal gains and losses and operating cash flow is positive have strong reflection, be